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I'm wondering if anybody knows of any free packages, scripts or command line tools that can report a comprehensive speed test on a drive (e.g. generating random data, and testing how long it takes to transfer it). The drive can be internal, external or on the network.

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That would be a job for bonnie++. There are other benchmark tools of course but this one does exactly what you listed and is sort of a de-facto starting place for read/write bench-marking disks.

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